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isolation des photons de grande impulsion transverse dans les collisions proton+proton à 200 GeV dans l'expérience PHENIX au RHIC

Abstract : Ultra-relativistic heavy ions collisions allow to reach an hot and dense matter. This new state, called Quarks and Gluons Plasma (QGP), would exist at the first moment of our universe according to the Big Bang theory. The PHENIX experiment, one of the interaction point of the RHIC collider at Brookhaven National Laboratory (USA), aims to study the QGP's signatures. Photons don't interact strongly with the matter and so are an accurate tool to explore the phase of QGP. Moreover photons are emitted during all the phases of the nuclear collision: from the initial state to the final hadronization. We will present a direct photon, produced by hard scattering process in the beginning of the collision, identification method (SICA, Spectroscopic Isolation Cut Analysis) applied on p+p collisions at 200 GeV. This method allows for a better discrimination between direct photons and the other contribution (mainly the electromagnetic decay of the neutral pion). One could find in this thesis the direct photon rate production obtained by SICA and compared to other analysis. With the p+p collisions we have an important reference for the more heavier collisions (Au+Au) where we assume the QGP formation.
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https://tel.archives-ouvertes.fr/tel-00137654
Contributor : Ahmed Hadj Henni <>
Submitted on : Wednesday, March 21, 2007 - 9:49:32 AM
Last modification on : Friday, June 22, 2018 - 9:31:35 AM
Long-term archiving on: : Wednesday, April 7, 2010 - 12:05:54 AM

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  • HAL Id : tel-00137654, version 1

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Ahmed Hadj Henni. isolation des photons de grande impulsion transverse dans les collisions proton+proton à 200 GeV dans l'expérience PHENIX au RHIC. Physique Nucléaire Théorique [nucl-th]. Université de Nantes, 2007. Français. ⟨tel-00137654⟩

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